lampholder,porcelain lamp socket,ceramic lampbase 1)E27,E40,E26,E14,B22 2)CE/LVD/ROHS 3)Metal:Copper/Iron/Aluminium E39 porcelain ... lampholder,lamp holder,porcelain lamp socket,ceramic lampbase ... 1.B22,E10,E12,E14, E26,E27,E39, E40 lampholder,porcelain knife switch,fuse unit series etc.2 ...